/Engine/Source/Runtime/MeshDescription/Public/MeshDescriptionBase.h
Returns the edges which form the polygon perimeter
void GetPolygonPerimeterEdges ( [FPolygonID](API\Runtime\MeshDescription\FPolygonID) PolygonID, [TArray](API\Runtime\Core\Containers\TArray)< [FEdgeID](API\Runtime\MeshDescription\FEdgeID) > & OutEdgeIDs ) const